Cap'n Refsmmat Posted May 27, 2004 Share Posted May 27, 2004 Normally, I have to wear glasses. However, when I don't put them on, I can still see clearly by doing this: I take both thumbs and forefingers and put them together so there is a tiny hole between them. I look through that. How can that help me see? Link to comment Share on other sites More sharing options...
jgerlica Posted May 27, 2004 Share Posted May 27, 2004 By focusing light on the retina? Link to comment Share on other sites More sharing options...
jgerlica Posted May 27, 2004 Share Posted May 27, 2004 basically it would be eliminating that which is out of focus, instead of using a lens to correct it. elimination instead of refraction.. Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted May 27, 2004 Author Share Posted May 27, 2004 Oh... I get it. Thanks! Link to comment Share on other sites More sharing options...
swansont Posted May 27, 2004 Share Posted May 27, 2004 basically it would be eliminating that which is out of focus, instead of using a lens to correct it. elimination instead of refraction.. To expand on this: a pinhole forces the light to have a one-to-one mapping of object and image - each point on the object has only one ray that goes through the pinhole and forms the image. So there is no way for multiple rays to focus at different depths or places and cause blurring. It's why you can make a pinhole camera. You just lose a lot of light in doing things this way. This is also why smaller apertures have larger depth-of field. Link to comment Share on other sites More sharing options...
admiral_ju00 Posted May 28, 2004 Share Posted May 28, 2004 wouldn't that also depend on the level of his estigmatism?? by blocking out most of the visible area, thereby bypassing the estigmatism and having a clearer vision. Link to comment Share on other sites More sharing options...
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